In our laboratory we developed and obtained plyelectrolytes based on co-polymerization (simultaneous and separate) by EB and MW irradiation of the aqueous solutions containing mixtures of different monomers (acrylamide, acrylic acid, sodium acrylate).

In Romania, obtaining and using polyelectrolyte for residual and surface water treatment is not so developed because the advantages of using them are not well known, and these are:

*reduce with 25% up to 50% the quantity of classic electrolytes needed;

*concentrations of 10 to 100 times smaller of classic materials are used, the final volumes of reactives which are used in water treating are considerably decreased, saving space, maneuver, energetic consume, means of transport (we mention that a polyelectrolyte mud treating station occupies an area ten times smaller than a classic electrolyte treating station).

*they do not produce metallic residuals in the mud left after water purge (mud resulted after classic electrolyte treatment, if deposited on agricultural field it can toxic because it contains iron ions, aluminum, calcium, which affect the metabolism of plants and animals.

*reduce with almost 60% the volume of the resulted mud by using them in comparison with the volume resulted from classic material treatment, which it reflects in the space economy for depositing the mud resulted from the purifying stations.

*reduce with approximately 5-10 times the contact, stationary and decantation time which determines a shorter process of water purifying.

*they are able to place the quality indicators in the limits imposed by the in force norms

*realizes a process of advanced separation of phases from the colloidal system which creates a very important biological effect: trains viruses and bacteria in the coagulation-decantation process so that the phase of biological chlorine purifying can be eliminated, and in this way avoiding formation of unwanted subproducts in the purifying drinking water stations.